Game controller back case



FIG. 1 is a front perspective view of a game controller back case showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof.

The broken lines in figures depict the portions of the game controller back case that form no part of the claimed design. 

CLAIM The ornamental design for game controller back case, as shown and described. 